Sewing-machine.



F. J. T. & H. C. BELL.

sEwme MACHINE.

APPLICATION FILED OCT. 6, 19H.

1,1 85,364. I Patented May 30, 1916.

inventors +veAev-k k J. Be-\\ u ahrw C. Be

UNITED STATES PATENT oEEIcE.

FREDERICK JOI-IN TURNER BELL, F BURY, AND HARDY CECIL 'BELL, OFPLADIHAM, ENGLAND, ASSIGNORS T0 TWIN BOBBIN SEWING MACHINE COMPANYLIMITED, OF BURY, ENGLAND, A LIMITED LIABILITY COMPANY.

SEWING-MACHINE.

Application filed October 6, 1911.

v To all whom it may concern:

Be it known that we, FREDERICK JOHN TURNER BELL, a resident of Bury, inthe county of Lancaster, England, and HARDY CECIL BELL, a resident ofPadiham, in the county of Lancaster, England, both subjects of the Kingof Great Britain and Ireland, have invented new and useful Improvementsin Sewing-Machines, of which the following is a specification.

This invention relates to sewing machines of that type in which therotary reel casing or loop divider or equivalent is driven by or frompins rotating around an axis which is not quite in prolongation of theaxis of the reel casing or the like but is slightly inclined therefrom.The pins alternately engage with and disengage from holes formed in thereel casing to drive it around while at the same time permlttmg thepassage around the casing of the needle thread loop. One form of suchdriving apparatus and reel casing is described in the specification toBritish Letters Patent No. 5247' of 1909. In that specification twodriving pins are described. Other numbers of driving pins alternatelyengaging with and disengagingfrom an equivalent casing are, however,

known.

According to this present invention three driving pins are engaged torotate a reel casing, the three driving'pins being so arranged anddisposed relatively to the casing that there is never more than one ofthem out of engagement with the casing at any one time, to permit thepassage of the needle thread loop while at times all three are inengagement. Also, and with the reel casing indicated and hereindescribedand illustrated, the pin which engages with the reel casing immediatelybehind the rear edge of the notch or gap in which the needle thread loopis formed, does so immediately after the loop of needle thread which hasbeen engaged by the hook has passed inward along the face of the rearedge of the notch or gap to the inside of the circular path de scribedby such pin. The hole for engagement with a pin which is neXt behind theA guard plate or guard plates consisting- Specification of LettersPatent.

Patented May 30, 1916.

Serial No. 653,140. of a stationary member or'of stationary membersbridging completely over the gap in the race lnto which the needledescends and as described in our British Letters Patent No. 3455 of 1910may beused between the rotary reel casing and the disengaged drivng pmso as to prevent the needle thread loop ballooning and becomingentangled bythls pm. The disengaged pin passes closely directly over theouter side of such a guard plate. y

In order to insure that the needle thread loop shall as soon as possiblebe carried to the bottom of the notch or gap in the reel casing, toenable the disengaged driving pin to be again engaged with its casing assoon as possible, to give the minimum amount of thread to be taken up bythe take up motion, and to insure that a regular and equal amount ofthread will always be formed into a loop at each stitch, we place whatwe will term a spreader? in the path of the needle the divider, directthe needle thread down to the bottom of the gap in the casing as thelatter rotates. When the loop is engaged by the spreader the rear edgeofthe gap in the casingcrosses the line of the guiding edge of thespreader at such an angle that asthe rotation of the casing continuesthe" point of intersection moves toward the bot tom of the gap in thecasing and the needle thread which is jointly engaged by the spreaderand the rear edge of the gap in the casing moves with such point ofintersection.

The rotary reel casing we prefer .to em ploy is of the constructionshown in the drawings and referred to hereimand it is preferablyprovided'with a reel carrier of the construction described. andillustrated.

Figure 1 illustrates in end elevation the reel casing, the three pindriving device therefor, and the spreader. Fig. 2 is an edge view of thesame devices. Figs. 8,4, and 5 illustrate the spreader and'thecooperating part of the reel casing in different positions. Fig. 6 is avertical longitudinal section of the reel carrier which it is preferredto employ; Fig. 7 is a view of such reel carrier taken from below.

A is the rotary reel casing consisting of two conical parts or shells atand Z), one, Z), being flatter than the other, jointed together at theirbases and rotating in the race B.

C is a single deep notch or gap formed in the casing and D is a hookformed in the periphery of the casing at the rear face of such gap toengage with the needle thread loop. These are all known.

The shell 6 is provided with three driving holes in which engage thethree pins E, E

E carried by arms of equal length equally disposed around a drivingshaft S. The driving shaft has its axis so obliquely disposed to theaxis of the reel casing and the pins are of such length that two of thepins are always engaged-with their holes in the casing and that there isnever more than one pin out of engagement with its driving hole in thereel casing at any one time. At other times all three pins are inengagement with their driving holes in the reel casing at one and thesame time.

With the pins in the position shown in Fig. 2 of the drawings the pinoccupying the lowest position is in deepest engagement with the casing.The other two pins being at the same vertical height are both engagedwith their driving holes but not deeply. As rotation of the casing takesplace in the direction of the arrow, Fig. 1, the pin of these latter twowhich is ascending comes more and more out of engagement with itsdriving hole until it is free therefrom when it arrives at about theposition indicated at E in Fig. 1. There is now a slight gap between theend of such pin and the reel casing and the needle thread loopwhich isnow being taken up by the hook D of the casing can pass along the rearface of the notch or gap 0 in the casing between the end of thedisengaged pin and the reel casing. By the time this pin, whiledescending, again comes to about the vertical height in .which it isrepresented in Fig. 2, the needle thread loop has passed it and the pinis again in engagement with its reel casing. Each pin in turn engageswith and disengages from the casing in the same manner. The manner inwhich the needle thread loop passes between a disengaged pin and thereel casing when being taken up by the reel casing or being deliveredtherefrom is well known.

Fixed closely adjacent to the rotary casing and so that its upper pointis in the path of the needle thread loop carried around by the hook ofthe rotary casing is the fixed spreader. This spreader is a smoothmetallic and thin plate G so fixed relatively to the rotary casing A andthe hole through which the needle thread passes through the machine bedplate H, as to'engage with the needle thread loop by entering it and toremain engaged or entered in such loop until the loop has been pusheddown by the spreader to about the bottom or inner part of the gap in therotary casing.

In Fig. 1 the hook D of the rotary casing is shown as just engaging withthe loop of the needle thread X. In Fig. 8 the rotary casing is shown ashaving moved slightly onward and shows the point of the spreader as justabout entering the loop of needle thread which is being carried aroundby the rotary casing. In Fig. 4 the rotary casing is shown as havingprogressed farther in its rotation.' The point of the spreader G isstill entered into or contained within the needle thread loop. That partof the needle thread which passes from the hole in the bed plate to andthrough the gap or notch on that side of the rotary casing on which thespreader is placed, thus passes over the outer face or part of the outerface of the spreader G and to do this crosses over the front or leadingedge of the spreader. This leading edge of the spreader is so shaped andso cooperates with the rear edge of the gap or notch C that as thethread loop is carried around by such rear edge of the gap the leadingedge of the spreader which is crossed by the needle thread loop pushessuch loop down the rear edge of the gap until it has reachedtheinnermost portion of that edge. This position has been reached whenthe rotary reel casing is in the position of Fig.5, and the thread maynow have been pushed to a position in which it has passed OK thespreader, or if the upper part of the spreader is still in the loop thecontinued rotation of the rotary casing from the position shown in Fig.5' will move the loop bodily away from the spreader and draw it off it.

Although a spreader is shown on one side only of the casing a second andsimilar spreader. may beused on the other side of the casing similarlycooperating with the rear edge of the gap.

Figs. 6 and 7 represent an improved form of reel carrier for use in thereel casing.

This reel carrier is provided with a plate R at its lowest part andopposite to the delivery eye J of the underthread, which lower plateacts as a counterweight to insure .the reel carrier remaining in itsproper position when employed with a rotary casing rotating around anapproximately horizontal axis even when the carrier is not engaged byits gate or retaining device, and also serves as part of the threadingdevice for the underthread. This plate extends about parallel withthespindle on which the reel is placed. It has a slit extending from oneedge through which the reel thread is drawn without threading. From theinner end of this slit the thread passes along the outside of the plateunder a tension spring K. The thread then passes up along the outer faceof the reel carrier in a slight groove formed along the projection Lwith which an ordinary hinged gate engages and passes up to the deliveryeye or like part J. The passage to this delivery eye is in a grooveformed in the metal, in which groove the thread is easily laid, and thegroove takes a helical twist or turn on its way to the delivery point oreye.

M is a small tube fixed to the carrier and adapted to fit upon thespindle or pin F in the rotary reel casing.

N is a second tube mounted so as to rotate upon the first tube M andprovided externally with spring boWs O by means of which a reel P placedover them is snugly and securely held. A smooth and concentric rotationof the reel upon its spindle carrier is thus insured.

\Ve claim 1. In a sewing machine driving device of the type wherein arotary shuttle is driven by driving pins engaging holes in the shuttle,the combination of a horizontal driving shaft, three driving arms fixedto such shaft and at right angles to the plane of the longitudinal axisof said shaft, a pin at the end of each of said arms, and a shuttle withholes formed therein in which said pins engage, the shuttle being placedat such an angle that two at least of the pins are always in drivingengagement in their so formed and arranged that every loop.

taken is immediately and positively pushed to the bottom of the notch toinsure that the loop shall in every case reach the bottom of the notchas soon as taken, and that every loop shall have the same quantity ofthread, substantially as described.

2. In combination with a rotary shuttle for a sewing machine, a reelcarrier having a counterweight plate to prevent rotation of said reelcarrier, a slot in the counterweight plate through which the threadpasses and a thread tensioning spring secured to the counterweightplateitself, substantially as and for the purpose set forth.

In witness whereof we have hereunto set our hands in the presence of twosubscribing witnesses.

FREDERICK JOHN TURNER BELL. HARDY CECIL BELL.

Witnesses WILLIAM GEO. HnYs, J. QC NNELL.

copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. 0."

